class_docstr: Information of each trial, refresh for each epoch
code: def clean_id(self):
      self.parameter_id = None
  
imports: import copy
  import logging
  import os
  import random
  import numpy
  from schema import Schema, Optional
  import nni
  from nni import ClassArgsValidator
  import nni.parameter_expressions
  from nni.tuner import Tuner
  from nni.utils import OptimizeMode, extract_scalar_reward, split_index, json2parameter, json2space
label_desc: Use image node_id 2 for calling the TrialInfo obj's underlying member method code with example usage: obj.clean_id() without return types